linux-kernel - Re: request_firmware API exhaust memory

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Message-ID: <o2n1ba2fa241004251222x6ab49726p9757fd8be4952bee@mail.gmail.com>
Date:	Sun, 25 Apr 2010 22:22:54 +0300
From:	Tomas Winkler <tomasw@...il.com>
To:	Greg KH <greg@...ah.com>
Cc:	Johannes Berg <johannes@...solutions.net>,
	Kay Sievers <kay.sievers@...y.org>,
	David Woodhouse <dwmw2@...radead.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Emmanuel Grumbach <egrumbach@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: request_firmware API exhaust memory

On Sun, Apr 25, 2010 at 7:37 PM, Greg KH <greg@...ah.com> wrote:
> On Thu, Apr 22, 2010 at 01:22:51AM +0300, Tomas Winkler wrote:
>> On Mon, Apr 19, 2010 at 5:59 PM, Greg KH <greg@...ah.com> wrote:
>> > On Mon, Apr 19, 2010 at 03:20:34PM +0300, Tomas Winkler wrote:
>> >> Lately we've been developing a device that rather more extensively
>> >> used request_firmware API in load and also using pm_notifiers to load
>> >> firmware.
>> >
>> > Do you have a pointer to your driver source anywhere that shows how you
>> > are trying to use the firmware api in this manner?
>>
>> I've attached a very simple  test driver I'm using.  Just wanted to
>> eliminate anything else.
>> Bellow is a little script that loads and releases the firmware. My
>> previous observation was wrong.
>> The free memory gradually decreases regardless of number or dangling
>> udevd forks, which are eventually collected if the sleep period is
>> long enough ~10s.
>
> That sounds normal for the free memory.  Kay, that's also to be expected
> for the udevd forks as well, right?

Sorry maybe I was not clear what I mean that the memory will be
eventually exhausted and system will crash
Is this normal? Actually I less suspect now udevd as the same happens
on android platform where there is no udev


Tomas
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